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  <h1 class="section-bar">Methods</h1>
  <div id="index-entries">
    <a href="classes/Engine/SpriteCollection.html#M000021">add (Engine::SpriteCollection)</a><br />
    <a href="classes/Engine/Sprite.html#M000059">alpha_to_color (Engine::Sprite)</a><br />
    <a href="classes/Engine/MenuState.html#M000029">button_down (Engine::MenuState)</a><br />
    <a href="classes/Engine/GameState.html#M000016">button_down (Engine::GameState)</a><br />
    <a href="classes/Engine/Game.html#M000050">button_down (Engine::Game)</a><br />
    <a href="classes/Engine/PlayState.html#M000006">button_up (Engine::PlayState)</a><br />
    <a href="classes/Engine/Game.html#M000049">button_up (Engine::Game)</a><br />
    <a href="classes/Engine/CreditsState.html#M000019">button_up (Engine::CreditsState)</a><br />
    <a href="classes/Engine/GameState.html#M000015">button_up (Engine::GameState)</a><br />
    <a href="classes/Engine/MenuState.html#M000030">button_up (Engine::MenuState)</a><br />
    <a href="classes/Engine/Sprite.html#M000058">collision? (Engine::Sprite)</a><br />
    <a href="classes/Engine/PlayState.html#M000011">decrease_energy (Engine::PlayState)</a><br />
    <a href="classes/Engine/Sprite.html#M000057">die? (Engine::Sprite)</a><br />
    <a href="classes/Engine/SpriteCollection.html#M000025">draw (Engine::SpriteCollection)</a><br />
    <a href="classes/Engine/GameState.html#M000014">draw (Engine::GameState)</a><br />
    <a href="classes/Engine/Game.html#M000048">draw (Engine::Game)</a><br />
    <a href="classes/Engine/PlayState.html#M000004">draw (Engine::PlayState)</a><br />
    <a href="classes/Engine/CreditsState.html#M000018">draw (Engine::CreditsState)</a><br />
    <a href="classes/Engine/Sprite.html#M000055">draw (Engine::Sprite)</a><br />
    <a href="classes/Engine/MenuState.html#M000028">draw (Engine::MenuState)</a><br />
    <a href="classes/Engine/Game.html#M000046">end_fade! (Engine::Game)</a><br />
    <a href="classes/Engine/Game.html#M000043">fade_off (Engine::Game)</a><br />
    <a href="classes/Engine/Game.html#M000044">fade_on (Engine::Game)</a><br />
    <a href="classes/Engine/Game.html#M000045">fading? (Engine::Game)</a><br />
    <a href="classes/Engine/Game.html#M000037">fonts (Engine::Game)</a><br />
    <a href="classes/Engine/PlayState.html#M000009">game_over? (Engine::PlayState)</a><br />
    <a href="classes/Engine/Game.html#M000040">game_state (Engine::Game)</a><br />
    <a href="classes/Engine/Game.html#M000041">game_state= (Engine::Game)</a><br />
    <a href="classes/Engine/Game.html#M000036">images (Engine::Game)</a><br />
    <a href="classes/Engine/PlayState.html#M000010">increase_score! (Engine::PlayState)</a><br />
    <a href="classes/Engine/SpriteCollection.html#M000023">init_list (Engine::SpriteCollection)</a><br />
    <a href="classes/Engine/Sprite.html#M000056">kill! (Engine::Sprite)</a><br />
    <a href="classes/Engine/Game.html#M000052">load_fonts (Engine::Game)</a><br />
    <a href="classes/Engine/Game.html#M000051">load_images (Engine::Game)</a><br />
    <a href="classes/Engine/Game.html#M000035">new (Engine::Game)</a><br />
    <a href="classes/Bullet.html#M000001">new (Bullet)</a><br />
    <a href="classes/Engine/MenuState.html#M000026">new (Engine::MenuState)</a><br />
    <a href="classes/Engine/GameState.html#M000012">new (Engine::GameState)</a><br />
    <a href="classes/Engine/CreditsState.html#M000017">new (Engine::CreditsState)</a><br />
    <a href="classes/Engine/SpriteCollection.html#M000020">new (Engine::SpriteCollection)</a><br />
    <a href="classes/Engine/Sprite.html#M000053">new (Engine::Sprite)</a><br />
    <a href="classes/Engine/PlayState.html#M000003">new (Engine::PlayState)</a><br />
    <a href="classes/Engine/MenuState.html#M000032">next_option! (Engine::MenuState)</a><br />
    <a href="classes/Engine/MenuState.html#M000031">option_selected? (Engine::MenuState)</a><br />
    <a href="classes/Engine/MenuState.html#M000033">prev_option! (Engine::MenuState)</a><br />
    <a href="classes/Engine/PlayState.html#M000007">process_input (Engine::PlayState)</a><br />
    <a href="classes/Engine/Game.html#M000042">quit (Engine::Game)</a><br />
    <a href="classes/Engine/SpriteCollection.html#M000022">remove (Engine::SpriteCollection)</a><br />
    <a href="classes/Engine/MenuState.html#M000034">select_option (Engine::MenuState)</a><br />
    <a href="classes/Engine/Game.html#M000039">sprite_collection (Engine::Game)</a><br />
    <a href="classes/Engine/Game.html#M000038">sprites (Engine::Game)</a><br />
    <a href="classes/Engine/PlayState.html#M000008">start_game_over (Engine::PlayState)</a><br />
    <a href="classes/Engine/Sprite.html#M000054">update (Engine::Sprite)</a><br />
    <a href="classes/Engine/PlayState.html#M000005">update (Engine::PlayState)</a><br />
    <a href="classes/Engine/MenuState.html#M000027">update (Engine::MenuState)</a><br />
    <a href="classes/Engine/SpriteCollection.html#M000024">update (Engine::SpriteCollection)</a><br />
    <a href="classes/Engine/GameState.html#M000013">update (Engine::GameState)</a><br />
    <a href="classes/Bullet.html#M000002">update (Bullet)</a><br />
    <a href="classes/Engine/Game.html#M000047">update (Engine::Game)</a><br />
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